package com.flower.subject.domain.utils;

import com.alibaba.fastjson.JSON;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;

/**
 * 缓存工具类
 * @author lavender
 * @version 1.0
 * @date 2024-07-24 18:07
 */
@Component
public class CacheUtil<V> {


    private Cache<String,String> localCache = CacheBuilder.newBuilder()
            .maximumSize(5000)
            .expireAfterWrite(10, TimeUnit.SECONDS).build();



    public List<V> getResult(String cacheKey, Class<V> clazz, Function<String,List<V>> function){
        List<V> resultList = new ArrayList<>();
        String content = localCache.getIfPresent(cacheKey);
        if(StringUtils.isNotBlank(content)){
            resultList = JSON.parseArray(content, clazz);
        }else {
            resultList = function.apply(cacheKey);
            if(CollectionUtils.isEmpty(resultList)){
                localCache.put(cacheKey,JSON.toJSONString(resultList));
            }
        }

        return resultList;
    }

}
